Lakhs of devotees thronged the banks of Ganga early in the morning to offer 'argaya' to the rising Sun god.
Chief Minister Nitish Kumar too woke up early in the morning and offered 'argaya'.
The celebration is a sedate affair at his official residence 7 Circular Road away from media glare where Kumar's sister-in-law is performing the puja.
However, at a stone's throw away at the residence of former chief minister Lalu Prasad, the mood was electric.
The former CM's all seven daughters and son-in-laws were present along with newly-elected MLA sons Tej Pratap Yadav and Tejaswi Yadav.
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Both Chief Minister Nitish Kumar and Lalu Prasad extended warm greetings to the people of Bihar on Chhath.
Samajwadi Party MP from Mainpuri Tej Pratap Yadav, for whom it was first outing on the occasion of Chhath after marriage with Lalu Prasad's daughter Raj Lakshmi this year, said, "The landslide victory of grand secular alliance made this Chhath special for us."
In fact, it is after a long time that Rabri Devi is observing Chhath in Patna. Earlier, she performed the puja in Delhi.
Elaborate security arrangement has been made on the banks of the Ganga and ponds in Patna and elsewhere. National Disaster Response Force personnel were patrolling the river banks.
Reports of devotees thronging rivers, ponds and congregating at their roofs and offering argaya to the rising sun came from across the state.
Sun temple in Aurangabad also saw heavy rush of devotees.